Mainly for flavor, it has a higher fat content so the texture will be a little heavier than with regular milk.
Cooking process mixing process baking process storing process mixing ingredient process etc..........
baking soda doesn't really have any ingrdients since it is used as an ingredient in cooking
it blows up from a chemical reaction
It can be used, however baking soda is an alkaline ingredient and must have some form of acidic ingredient to activate it, such as cream of tartar, buttermilk, even lemon juice. However by itself even activated with a single acidic ingredient it will be fast acting and will not leaven the product as much as commercial baking powder.
There are some simple ingredient swaps you can make during cooking and baking to make
No, you can substitute buttermilk for milk but not for baking powder.
There are some simple ingredient swaps you can make during cooking and baking to make
Yes but once it's been frozen it's only suitable for baking or cooking, is not very drinkable after being frozen.
Leavening
Yes, you can use buttermilk with baking powder.
Baking, as opposed to cooking, is a more precise science. The proportion of each ingredient to another needs to be exact for produce the desired results.
They still make a buttermilk baking mix.